Growth; Yield Attributes and Yield of Rice {Oryza sativa L.) as Affected by Age of Seedling and Time of Nitrogen Application underTemperate Conditions

摘要

In order to study the effect of seedling age and time of nitrogen application on growth, yield attributes and yield of rice (Oryza sativa L), a field experiment was carried out at Research Farm of Sher-e-Kashmir University of Agricultural Sciences andTechnology of Kashmir, Shalimar, Srinagar. The experiment was laid out in randomized completely block design with three replications. Treatments included 3 levels of seedling age (25,35 and 45 days old seedling) and 6 levels of time of nitrogen application (Control, Recommended practice, 1/4 basal and % in 3equal splits at 14 days interval, V* basal and % in 2 equal splits at 14 days interval, Vi basal and Vi in 2 equal splits at 14 days interval, % basal and remaining at LCC <4 @20 kg ha~(-1)1 per application). Yield of rice increased significantly by transplanting 35-days old seedling with concomitant improvement in yield attributes viz., panicles m~(-2), panicle weight, spikelets panicle'1, grains panicle"1 and growth characters like plant height,tillers m~(-2) and leaf area index. Seedling age didn't make a significant difference on panicle length and 1000-grain weight. Application of nitrogen as % basal and remaining at LCC <4 @20 kg ha~(-1)1 per application resulted in improvement in yield along with growth and yield attributing characters. Highest benefit: cost ratio of 2.19 was also recorded when 35-days old seedlings were fertilized with % N as basal and remaining at LCC <4 @20 kg ha~(-1)1 per application. It is concluded that the yield ofrice can be improved by transplanting 35-days old seedling under late transplanted conditions and by following LCC guided nitrogen management.